Magnetic switch



July 30, 1963 KAZUMA TATElSHl 3,09

MAGNETIC SWITCH Filed 001;. 18, 1960 1 5 Sheets-Sheet l 5 /5 57 4 I I m 20 Z? 10 5 7 25 /Z 0 z 26 o I? z 5 7 4 l0 July 30, 1963 KAZUMA. TATYEISHI MAGNETIC SWITCH 5 Sheets-Sheet 2 Filed Oct. 18, 1960 I of INVENTOR.

July 30, 1963 KAZUMA TATEISHI MAGNETIC SWITCH 3 Sheets-Sheet 3 Filed Oct. 18, 1960 llllllllllll INVENTOR.

United States Patent 3,09,730 MAGNETIC SWITCH Kazuma Tateishi, 2, l-chome, Narutaki Harukicho, Ukyoku, Kyoto City, Japan Filed Oct. 18, 1960, Ser. No. 64,239 3 Claims. (Cl. 200-104) This invention relates to improvements in or relating to magnetic switches.

Heretofore, in those magnetic switches having multiple contacts, the stationary member carrying stationary contacts which are to be positioned opposite the movable contacts has been made of two parts :or after the movable member carrying movable contacts had been placed at its position, stationary contacts have been attached to the stationary member, and they have the drawbacks of difficult assemblage and necessity of a great number of parts.

This invention has for its objects to do away with such defects.

:In the accompanying drawings,

FIG. 1 is a front view of the magnetic switch according to this invention with a partial section,

'FIG. 2 is a side view of the same with partial sections,

FIG. 3 shows the upper member carrying stationary contacts viewed from below,

FIG. 4 shows the lower member and the movable member viewed from above,

FIG. 5 are perspective views off the upper member, the lower member and the casing containing a magnet,

*FIG. 6 shows the movable member carrying movable contacts,

FIG. 7 shows the contact carrying metal piece, and how it is attached to the member,

FIG. 8 shows the magnet,

FIG. 9 is a side view of the magnet and the armature,

FIG. 10 is the section through the line (AA) in FIG. 9,

FIG. 11 is a plan view of the magnet, and

'FIG. 12 shows the shading coil.

The magnetic switch according to this invention consists essentially of tour parts, namely, the upper stationary member 13 carrying stationary contacts 111, the lower stationary member 12 carrying stationary contacts 11, the movable member 4 carrying movable contacts 7 and 7 which is movable between said stationary members 13 and 12, and a casing 14 containing a magnet 1.

.1 is the iron core of E-f-orm, 2 is an energizing coil, 3 is an armature of 'E-form cooperating with the iron core 1, 4 is the movable middle member carrying movable contacts 7 and 7 and connected with the armature 3 by means of a pin 5, 6 are windows provided in the movable member 4 in which metal pieces 8 and 8' carrying contacts 7 and 7 are inserted with springs 9, said springs 9 and pieces 8 and 8' being separated by insulating pieces, 12 is the lower stationary member carrying stationary contacts 11, and 10 is a contact carrying U-formed metal piece having a window 28 in which the projected portion 32 of the member 13 is inserted and which is fixed by a screw 30 passing through an elastic metal 29.

I14 is the casing of insulating material. The upper and the lower members 112 and 13 are joined with the casing 14 by means of bolts 1'5 and nuts 16.

:17 are springs interposed between the movable middle member 4 and the casing 14 so as to keep said movable member '4 raised upward. 18 are terminals threaded to the upper edge of the casing 14 and are connected with the energizing coil 2.

In order to guide the movements of the movable member 4, grooves 19 are provided at side walls which cooperate with the rib 20 provided at the inner walls of the 3,099,730 Patented July 30, 1963 2; lower stationary member 112 and the rib 20 provided at the inner walls of the upper stationary member 13. In short, when the upper member 13 and the lower member 12 are joined, the iii) 20 provided in the upper member 12 is positioned between the lower member 1 2 and the movable member 4.

In the upper member 13, partition walls 22 are provided to separate the contacts from each other. The lower portions '23 of said partitions are positioned between the grooves 24 provided in the lower member 12 and the grooves 25- provided in the movable member 4.

According to this invention, the assemblage is very easy, because the movable member 4 can be inserted into the lower member '12 from below and is movable laterally Within the lower member 12. After the lower member 12 is joined with the movable member 4, the upper member 13 is put upon them, then the rib- 20 provided in the upper member 13 will be positioned between the lower member 12 and the movable member 4 whereby the lateral movement of the movable member 4 is barred while only the vertical movement is allowed. Further, at the top of each window 6 of the movable member 4, an opening 26 is formed to facilitate the insertion of the movable contacts 7 and 7.

Heretofore, in the magnetic switches of this type, after the movable member 4- has been inserted in the lower member 12, movable contacts 8 are inserted one by one, or the lower member 112 is divided into two parts at its center and a pair of movable contact carrying members having movable contacts 8 and 8 are attached on both sides. However, in such switch assemblages, the insertion of movable contacts 8 and 8 in very narrow spaces is very difficult and very skillful hand is necessary to work it. Further, the number of necessary parts is too many and many working steps are necessary.

Further, according to this invention, the iron core 2 has peculiar shading coils 33, said coil 33 is a metal frame having downeast end portions 33 at both ends. Two parallel grooves are cut in the upper portion of the laminated iron core into which the shading coil 33 are forced in and .a part of the upper edge 36 of the laminated iron is cut and bent down on the downcast 33' as shown in FIGS. 9, l0 and 11. Thus the shading coils 33 are iirmly held in the iron core and would not easily be removed away.

The operation of the magnetic switch is as follows:

When a current ilows through the energizing coil 2, the iron core 1 will be magnetized and attract the armature 3 whereby the movable contacts 7 will be brought into contact with the stationary contacts 1:1 while the movable contacts 7 will be away from the stationary contacts 11. When the current is cut ofi from the coil 2, the iron core 1 will be demagnetized whereby the movable member 4 will snap up and the contacts 7, 7, 11 and 11' will return to their initial positions at once.

By the provision of the shading coils 33, the magnetizing action at the central portion of the iron core 1 precedes those at side portions of the iron core 1 whereby the downward movement of the middle member 4 can be elfected very smoothly.

The armature .3 and the iron core .1 have side projections -27 and 34 respectively which cooperate with the vertical guiding grooves 35 provided in the inner walls of the casing 14. Such side projections are formed inthe outer surfaces of the laminated iron. 38 is a flat spring placed between the iron core '1 and the bottom of the casing 14.

I claim:

1. In a magnetic switch, a casing containing an electromagnet, a stationary member attached to and disposed over the casing, a movable member mounted within the stationary member, an upper member mounted above the movable member and 'fastened to the stationary member, lower stationary contacts mounted on the stationary member, partition walls on said stationary member separating said contacts, said partition walls being provided with vertical grooves at their edges, the stationary member having Side walls, one of which is provided With a vertical rib, the movable member carrying movable contacts, partition walls on the movable member separating the movable contacts, the latter walls having vertical grooves in their outer edges, partition Walls on the upper member entering the grooves in the partition walls of the stationary and movable members, the upper member having an end wall provided with a vertical rib, and the movable member having end Walls provided with vertical grooves which respectively engage with the rib in the end wall of the stationary member and the groove in the end wall of the upper member.

2. In a magnetic switch as provided for in claim 1, wherein the partition walls of the movable member are provided with window openings extending through them, movable contacts extended through said openings and 5 springs arranged in said openings between the contacts.

3. In a magnetic switch as provided for in claim 1, including an armature carried by the movable member 'for co-operation with the electro magnet, said movable contacts being spring-separated.

References Cited in the file of this patent UNITED STATES PATENTS 

1. IN A MAGNETIC SWITCH, A CASING CONTAINING AN ELECTROMAGNET, A STATIONARY MEMBER ATTACHED TO AND DISPOSED OVER THE CASING, A MOVABLE MEMBER MOUNTED WITHIN THE STATIONARY MEMBER, AN UPPER MEMBER MOUNTED ABOVE THE MOVABLE MEMBER AND FASTENED TO THE STATIONARY MEMBER, LOWER STATIONARY CONTACTS MOUNTED ON THE STATIONARY MEMBER, PARTITION WALLS ON SAID STATIONARY MEMBER SEPARATING SAID CONTACTS, SAID PARTITION WALLS BEING PROVIDED WITH VERTICAL GROOVES AT THEIR EDGES, THE STATIONARY MEMBER HAVING SIDE WALLS, ONE OF WHICH IS PROVIDED WITH A VERTICAL RIB, THE MOVABLE MEMBER CARRYING MOVABLE CONTACTS, PARTITION WALLS ON THE MOVABLE MEMBER SEPARATING THE MOVABLE CONTACTS, THE LATTER WALLS HAVING VERTICAL GROOVES IN THEIR OUTER EDGES, PARTITION WALLS ON THE UPPER MEMBER ENTERING THE GROOVES IN THE PARTITION WALLS OF THE STATIONERY AND MOVABLE MEMBERS, THE UPPER MEMBER HAVING AN END WALL PROVIDED WITH A VERTICAL RIB, AND THE MOVABLE MEMBER HAVING END WALLS PROVIDED WITH VERTICAL GROOVES WHICH RESPECTIVELY ENGAGE WITH THE RIB IN THE END WALL OF THE STATIONARY MEMBER AND THE GROOVE IN THE END WALL OF THE UPPER MEMBER. 